8.4.1 Instrument Download

To download data from the instrument press the Read-Inst button. The whole contents of the instrument’s memory are downloaded, and the newest record is displayed in the graph.

The Record Selector at the top-left of the page (Figure 10 (7)) indicates how many records have been downloaded. It shows one separate tick per record downloaded. Use the blue slider to select the desired record. When selecting a record the indication No-Data is displayed on top of any empty graph.

Note:        It is legal for a record to contain no data at all. This may mean that the recording was started and stopped before any data had time to be recorded. It can also be the case if no data type was selected to be recorded. In such a case the time-stamp is still valid and can be used to determine when that recording occurred.

The Source indicator shows the User-ID of the instrument, if any has been set.

The time scale can be displayed in absolute (date/time) or relative (fractional seconds) format. The absolute format exposes the time-stamp that was written in memory with the record. Relative time is more useful when examining raw signals.

When viewing acceleration data, the scale can be chosen as g or m/s2, in linear or dB scale for RMS values.

When viewing velocity data the scale is m/s, in linear or dB scale for RMS values.

By default the graphs display signals or RMS levels on a per-axis basis. But when the Acceleration/Inclination button is set to Inclination, and if the recording includes the average acceleration along the three axes, the graphs combine the acceleration components and show:

The norm of the acceleration on the top-most graph. This is normally 1g if the instrument is stationary and only subjected to changes in inclination.
The Theta tilt around the X-axis on the middle graph. The inclination is presented in degrees.
The Phi tilt around the Y-axis on the bottom-most graph. The inclination is presented in degrees.